50x-100+160=55x-55
    70（1+ x）∧400=2000000
    59.08=X-2/x
    x^2+4*x+2=0
    V=2571+2512+152.49+0.04V+244.47+0.0538V+0.1V
    V=2571+2512+(2571+2512)*0.03+0.04V+244.47+5.38V+10V
    （2/5）/18*13=X
    x=3
    x+√x²-8＝0
    4.2053=（（26.99*0.829（x+0.1））/（1+0.829（x+0.1））*（（100-7.84-1.06）/100）*（1/(1+0.31*1.06）+（（2.96（x+0.1））/（1.31*0.101325））
    12t^2-56t+57=0
    16×t^2-56t+57=0
    x/（x+15）=0.9
    x/x+15=0.9
    x^2-19X=180
    x^2+19X=180
    2*x^2+13*x+20=0
    x^2+8*x+8=0
    X^4=84X^2+192sqrt3X+576
    X^3-4sqrt3X-36X-48sqrt3=0

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